Index: sys/powerpc/aim/aim_machdep.c
===================================================================
--- sys/powerpc/aim/aim_machdep.c
+++ sys/powerpc/aim/aim_machdep.c
@@ -478,7 +478,7 @@
 	 * should do.
 	 */
 	if (cpu_features2 & PPC_FEATURE2_ARCH_3_00) {
-		radix_mmu = 0;
+		radix_mmu = 1;
 		TUNABLE_INT_FETCH("radix_mmu", &radix_mmu);
 		if (radix_mmu)
 			pmap_mmu_install(MMU_TYPE_RADIX, BUS_PROBE_GENERIC);
Index: sys/powerpc/powerpc/pmap_dispatch.c
===================================================================
--- sys/powerpc/powerpc/pmap_dispatch.c
+++ sys/powerpc/powerpc/pmap_dispatch.c
@@ -83,7 +83,7 @@
 
 SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, "VM/pmap parameters");
 
-int superpages_enabled = 0;
+int superpages_enabled = 1;
 SYSCTL_INT(_vm_pmap, OID_AUTO, superpages_enabled, CTLFLAG_RDTUN,
     &superpages_enabled, 0, "Enable support for transparent superpages");
 
Index: sys/powerpc/pseries/mmu_phyp.c
===================================================================
--- sys/powerpc/pseries/mmu_phyp.c
+++ sys/powerpc/pseries/mmu_phyp.c
@@ -134,6 +134,7 @@
 	int idx, len, res;
 	bool has_lp;
 
+	radix_mmu = 0;
 	root = OF_peer(0);
 
 	dev = OF_child(root);